Metal-bending machine.



M. GRIFFIN.

METAL BENDING MACHINE,

APPLICATION HLED JULY 5.1915.

3 SHEETS-SHEET I.-

Patented 12, 1918,

A. M. GRIFFIN.

METAL BENDING MACHINE.

APPLICATION FILED JULY 5.1916.

1,2585%. Patented Mar. 12, 1918.

3 SHEETS-SHEET 2- IINVEN TOR. fill ab Mfirgffih.

, r5 A TTORNE Y A. M. GRIFFIN. METAL BEINDING MACHINE.

APPLICATION FILED JULY 5. I916.

9%. Patented Mar. 12, 191&

3 SHEETS-SHEET 3.

martian smarts PATENT onnron.

ALVAH M. GRIFFIN, OF KANSAS CITY, MISSOURI, ASSIGNOR T0 ANDREW A. KRAMER,

METAL-BENDING MACHINE.

Specification of Letters lat'ent.

PatentedMar. '12, 191s.

Application filed July 5,1916- Serial in. 107,522.

To all whom it may concern:

Be it known that I, ALVAH M. GRIFFIN, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Metal-Bending Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to a metal bending machine and more particularly to a machine of this character for forming the corners or hips of a sheet metal buildingsuch as a bin or garage wherein the wall parts are ribbed or joined together by box joints, the principal object of the invention being to provide a machine whereby the ribbed strips may be bent without buckling.

In accomplishing this object I have pro- Vided the details of structure hereinafter de-' scribed and illustrated in the accompanying drawings, wherein Figure I is a side view of a metal bending machine constructed'according to my invention.

Fig. II is a verticalsectionof the same.

Fig. 111 is a horizontal section on the line III-J11, F ig. I, particularly illustrating the forming tables and their clamping means.

Fig. IV is a perspective View of a part of v the machine, showing a plate in place on the forming table before being bent, parts of the machine and plate being broken away for better illustration.

Fig. V is an end view of the pivotally mounted forming tables and their clamping means.

Referring more in detail to the drawings:-

1 designates a metal bending machine constructed according to my invention, comprising a base 2 of such height as to conveniently support the working parts thereon,

and secured at opposite sides thereof ,by-

bolts 3 are spaced standards 4, connected at their upper ends by plates 5-5 that are.

The piston 8 is actuated by a fluidrpressure medium which is admitted to the cylin der at either side of the piston through pipes 1617 leading from a main supply pipe 18 through a fourway valve 19, whereby themedium may simultaneously be admitted to one side of the cylinder and drain from the other side back through the valve to exhaust, to effect and permit movement of the piston; the action of the valve being controlled by a valve lever 20.

Secured to the cross-head 10 by bolt 21, is a presser head 22 comprising'flanges 23 for receiving the bolts 21 and a head portion 24, the face of which is curved in a convex arc of the'curvature to which it is desired to bend the metal.

Pivotally mounted below the presser head 22, in spaced bearings 25,26 carried on arms 27-27 at each side of the baseadjacent the standards 4, is an ironing table 28, which comprises paired sections 2929 supported at their outer corners in the bearings 25 26 and which are adapted to swing downwardly at their adjacent free edges under pressure of the head 22, but are normally supported in a horizontal plane as presently described.

The table sections 2929 comprise corrugatedv face or ironing surfaces 3131 and downwardly extending edge flanges 3232; the ironing surfaces being provided with adapted for receiving the-joint or rib porvided with corrugations for coiiperatingwith the corrugations in the ironing tableto. hold the metal and prevent the metal from slipping on buckling Pivotall-y mounted on studs 37 at the lower corners of the flange-32. are rods. 3.8,

which extend forwardly through collars 89 that are pivota-lly carried ontstuds 40; ontlie lower corners of the flange 3'2: and: are con:- neoted at their: outer endsby' a. cross. rods t1;

Pivotally mounted: on. the rod 4-1 is a. fluid pressure medium cylinder 42, having an iii-- take, or outlet' pipe 453 and; a valve- 44.- to

admit or. release thepressure medium there to. or. therefrom to actuate-a. piston. 4'6: and rod 4'7, the rod: being pivotally connected at itsouter GDCli withthe lower. edge of t-hetabl'e flange 32 between ears 48, so that when a pressuremedium is admitted; tot-he cylinderthepiston is forced outwardly to move the ITOlllllg surfaces. of the table. 28 toa horn zontal. position, and upon release of the pros sure medium from the cylinder the-tablewill;

be allowedtto open. downward].3 at. its transverse; centen Presuming. the partsto be so constructed, a plate to beformed: is placedgonthe table with the ribs seated: in the table grooves.

Thepresser head is then lowered: by admit-- ting pressure medium: to the upper end of the: cylinder. to more the -P1Si3011 and cross headdownwardly;

As the head moves.downwardly, the ribs 36 seat within the grooves of the metal plate and clamp the plate-solidly againstthetable to prevent its slipping, and when a: jointedplate is being bent: toprevent thejoints from-opening;

With the oresscr' head seated a ainst the c. plate to be bentand the pressuremednnn turnedilnto the cylinder- 7, the valve 44 is turned togradually release the pressure medium from the cylinder 42, so that the pressure in the cylinder Twillovercome that in thecylinder--42 thus forcing the piston l6 and rod-47 outwardly allowing the table sections to; open downwardly beneaththe presser head, so-that theplate isroll'ed'on the-head '22 andgiven a curve corresponding to the curvature oftheheadi After the bending has been completed the:

valve 20*is turned to reverse the piston action and the pressen head israised from the; table, so. that'the formed -plate maybe removed.

Thetable sections are then restored to their .normalposition by turningpressure medium into the cylinder 42 to move the piston and rod outwardly and the flanged parts of the table inwardly to bring the ironing-surfacesiagain into a horizontal position.

It is apparent that by so constructing the machine, ribbed plates may be placed on the ironing" table-- with the ribs in the tablegrooves and that the ribs of the presser head seating therein will hold the plate firmly in position and" prevent the plate from buckling or JQlHiZS Of a positioned plate from opening during the bending operation.

slid-ably mounted between. the standards, a,

table mounted above. thebase piwota-lly sup:-

ported at its: corners, and; adapted to; open downwardly at, its transverse, center, a. piston. for: actuatingsthe.presscr. head: toward and. from the. table, a. pressure cylinder,. a piston; operable in said; cylinder; and. means operatively connecting said. cylinder and piston with. the: movable table. sections to yieldingly retain. the latter against the presser head;

2; In. a. bending machine thecombination; withl a. movable; presser head, of; a table cornprisingv paired sections piivotally' sup: ported at theiri outer edges and adapted. to open; downwardlyat: their adjacent: edges and havingdfowntunned': flanges: at. their outer edges, collars pivotaily'mounted at-the lower corners of one of" saidtablefianges, and. arms. pinotally mounted at: the. lower corners ofsthe opposite section. and. slidably, extended through said collars. I

3; a bending; machine: the combination with a. movable presserj head; of: a table comprising. paired: sections. pivotall y sup ported at? their: outer: edges: anch adapted to open downwardly at their adjacent edges, and; having downturned: flanges at their outen edges,- collars; pivotally' lTlOUIliiedi at. the lower. corners-poi: one of saids'table flanges,..

armslpivotally mountedztat the lower corners of the opposite sections and slidab'ly; ex.- tended' through. saidicollars, a cross member on saidtarms: and: yieldable means connected with said cross member and with one of'rthe table members for: resisting openingv movement of the table members and returning the same to table forming position... 1

45. Ina bending machine a the combination. with a movable p resser' head; of a". table; comprising:- paired sections. pivotally sup ported atntheirr outer edges and. adapted. to

of the opposite sections and slidably exon said arms, a cylinder carried by the cross member, a piston in said cylinder connected with one of the table members, and means .10 for controlling intake and outlet of a fluid pressure medium to and from said cylinder. In testimony whereof I aflix my si nature.

ALVAI-I M. GRIfiFIN.

open downwardly at their adjacent edges and having downturned flanges at their outer edges, collars pivotally mounted at the lower corners of one of said table flanges, arms pivotally mounted at the lower corners tended through said collars, a cross member Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of 2mm,

Washington, D. C. 

